Another question springs to mind actually, albeit of lesser importance.
When you're playing ball on the ship, does the "motion of the ocean," so to speak, come into play much? Do you notice any undulations from the waves, or is it pretty level, mostly? And how's the wind factor?
I know, I know, I should just go and find out for myself. But I'm curious, and my cruise isn't until next year, so I have a long time to prepare.